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Reread paragraph 2: First, never ride your bike if it has a flat tire. Riding around on a flat tire is not only difficult, but also dangerous-for both you and your bike. Riding a bike with a flat tire can cause you to fall and injure yourself and may damage your bike's wheel It's less complicated and less expensive to fix a flat tire than it is to replace an entire wheel.
What is the KEY IDEA of this paragraph?
A) Riding on a flat tire can end up damaging the bike and could cause you to injure yourself.
B) Fixing a flat tire can be an expensive repair.
C) Get someone else to repair your bike's flat tire so you don't injure yourself.
D) Avoid danger by making sure your tire is in good shape before you ride.